From the post How to change WordPress User Role capabilities we know already how to make it for the ordinal not multi-user (MU) WordPress. It this post I will show you how to change the user role capabilities for the WordPress MU platform.
As you know WPMU lets to have multiple blogs under single WordPress installation. Blog list is stored in the wp_blogs database table. We will use blog ID attribute (blog_id field value) from this table. WPMU stores every blog data in the separate database tables set. Every blog data set differs with its blog ID in the name of the database tables, e.g. blog with ID=1 has wp_1_options table, blog with ID=2 has wp_2_options table, etc. So, to get the blog id=1 user roles capabilities from the database we can use this SQL query

From January, 4th, 2010 WordPress 2.9.1 is available for download. The most of issues updated in this WordPress version are shown already in the “WordPress 2.9.1. incoming” article. You can find the full list of files updated in the 2.9.1 version comparing to version 2.9 in this article.
You need to update your current WordPress installation to the latest one as soon as possible. Make it the solid rool for any new WordPress release. No matter if you did not see any bugs which this update fixes. It is for security reason primarily.

December 23, 2009 WordPress Development team announced the WordPress 2.9.1 Beta release. You can see the original post at WordPress Development Blog.
First, critical bugs were fixed in order to process scheduled posts and pingbacks correctly. Some other lesser critical updates were made too. Full list of updated/fixed issues, original discussion between WP developers together with code changes can be found at WordPress Bug Tracker. WordPress 2.9.1 Beta 1 package can be downloaded for the evaluation here.
Looking for general review of updates which were made in WordPress 2.9.1? Continue reading.

WordPress team announced availability of WordPress version 2.9 “Carmen”. You are welcome, forthcoming fresh and new WordPress version 2.9!
We are familiar with some exciting new features of WordPress 2.9 already. We investigated it with the help of WordPress 2.9 beta version. For more details you can look this post WordPress 2.9 new features. Comprehensive list of new or enhanced features is published at “WordPress 2.9, oh so fine” post, including the mention of exciting new “Easier video embeds” feature.
In order to use WordPress version 2.9 “Carmen” you need download it from this download link first.